Here is the full list of all 15 The Stranded Traveler achievements.
Destroy the corrupter of the earth and remove them from power
Destroy an astroid while flying a spaceship
upgrade something at the alchemist
Find out who corrupted the earth
Visit another planet
Kill Elemental Boss
Kill 25 enemies
Complete the moving water and wall run
Finish a level with 100 or more HP
Upgrade your characters HP
Drink a potion
Win once at the Gambler
Try your luck at the Gambler
Open a coin chest
Pickup an enemy drop